Hemoglobin variant HbG-coushatta (beta-22 Glu --> Ala) found by dissociation of blood glucose from values of HbA1C measured by HPLC.

Objective: Unexpectedly low values of HbA1C, measured by HPLC compared with their blood glucose levels were found in three related persons. We investigated whether this discrepancy was due to abnormal hemoglobin.

Patients And Methods: HbA1C was measured by latex agglutination and ordinary HPLC.